How does this unit connect to the thermostat for the in floor heating. My current unit has the wires connected to the back of the unit.

Hello, this unit has 4 terminals at the back, 2 terminals L(L1) and N(L2) on one end, this is where you connect the power to supply the thermostat, and at the other end you have 2 terminals for the Load (heater) No's 1 and 4. The thermostat also has an option to connect a floor sensor, this connection is accessible behind the screen.

I install it and after couple months it says ground is missing what I need to do to fix it

Is it possible the thermostat message is "Ground fault"? If, during normal operation, the GFCI trips, or thermostat shows "Ground fault", it is possible your heater has a ground fault! To check whether it is a ground fault or nuisance tripping, press “Standby/Reset”. If this causes the red LED to stop flashing and stay off, it was nuisance tripping and the system is operating correctly. If this does not occur, there is a ground fault! In case of a ground fault, it is important to have the heater installation checked by a qualified electrician according to local and national regulations.

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OJ Microline UDG Programmable Thermostat for Heated Floor w/Class A GFCI - 120/240v in Floor Heater Thermostat - Dual Sensing - Includes a Flooring Sensor - 3-Year Warranty & USA Product Support

Product ID: 186959383

Details

Brand
OJ Microline
Color
White
Controller Type
Push Button
Model Name
UDG-4999
Special Feature
Programmable

⚡Dual voltage 120/240V power

🌡️Dual sensing air & floor temp

🛡️Built-in Class A GFCI safety

$235.50

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Description

🔥 Stay warm, stay smart — the thermostat that thinks ahead! 🌡️

SMART DUAL SENSING - Monitors both air and floor temperatures for precise, consistent heating across all floor types.
DURABLE DEPENDABLE - Backed by a 3-year warranty and USA-based support for peace of mind and lasting performance.
SAFETY FIRST ALWAYS - Class A GFCI with self-testing ensures top-tier protection in wet room environments.
TAILORED COMFORT EVERY DAY - 7-day programmable schedule adapts to your lifestyle for perfect warmth and energy savings.
CHILD LOCK ENERGY INSIGHTS - Prevent accidental changes and track energy use to stay efficient and in control.

The OJ Microline UDG Programmable Thermostat is a versatile, dual-voltage (120/240V) heating controller designed for electric radiant floors. Featuring dual sensing for air and floor temperature, a built-in Class A GFCI for enhanced safety, and a customizable 7-day program, it ensures efficient, comfortable heating across various floor types. With child lock, energy consumption readout, and a 3-year warranty supported by USA customer service, it’s the smart choice for modern heated floor management.

Specifications

ASIN	B084GXTZDS
Additional Features	Programmable
Best Sellers Rank	#444,992 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #494 in Home Programmable Thermostats
Brand Name	OJ Microline
Color	White
Connectivity Protocol	Wired
Connectivity Technology	Wired
Control Method	Remote
Control Type	Button Control
Controller Type	Push Button
Customer Reviews	4.3 4.3 out of 5 stars (41)
Display Type	Manual
Included Components	Floor Sensor
Item Weight	12 ounces
Manufacturer	OJ Microline
Material Type	Other
Model Name	UDG-4999
Model Number	746160537634
Mounting Type	Wall Mount
Number of Items	1
Power Source	Electric
Product Style	Modern
Shape	Rectangular
Specification Met	energy
Temperature Control Type	Digital
Unit Count	1 Count
Voltage	120 volts, 240 volts
Wattage	3600 watts

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$235.50

Duties & taxes included

In stock

Sold byAmazon British Virgin IslandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to British Virgin Islands.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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